Parts

Every part, bolt for bolt.

The complete bill of materials. Links are for reference; if you want to donate a part, email us first so we can confirm the spec.

Line items
68
Budget
$1,472–1,583
Donated
12
Still needed
50

Optics · 5

  • Primary Mirror

    Generously donated — the heart of our telescope

    254mm (10") f/4.48 parabolic

    1 × —

    Donated · Pacific Holographics

  • 70mm minor axis elliptical flat

    1 × $80

    Needed

  • Spider + Secondary Holder

    3D-printed in-house: Spider Vane v2 ×3, Hub Plate v2, collimating Secondary Hub v2 — see Onshape 'Projected Telescope Design v1'. Replaces Protostar purchase ($85–120 saved)

    3-vane printed spider + collimating hub (ASA)

    1 × $0

    In-house · 3D Print

  • Focuser

    Donated ToupTek AAF motor provides motorized fine focus

    1.25" Crayford single-speed (GSO)

    1 × $95

    Needed

  • Flocking Material

    Lines the upper tube assembly to reduce stray light

    Self-adhesive black velour

    1 × $13

    Needed

Structure · 17

  • Cabinet-Grade Plywood

    Mirror box, rocker box, and ground board

    3/4" cabinet-grade birch plywood (PureBond)

    1 × $81

    Needed

  • 3/4" plywood, 20" diameter

    1 × $10–15

    Needed

  • Aluminum Tubes

    3× 72" lengths cut to six 635mm poles (6-pole / 3-pair truss)

    1" OD × 0.058" wall truss poles

    6 × $104

    Needed

  • Strut Connectors

    Printed Truss Pole Clamp v2 ×6 — replaces Aurora CNC blocks ($40–80 saved)

    3D-printed pole clamps (ASA)

    6 × $0

    In-house · 3D Print

  • Truss Shoes

    Printed in-house: 2× SKEW + 1× CENTER — bolt to mirror-box walls, receive the pole pairs

    3D-printed double-pocket pole shoes (ASA)

    3 × $0

    In-house · 3D Print

  • UTA Ring Segments

    3 per ring × top+bottom — one universal part, clearanced finger joints

    120° ring segments, Ø337/305 (ASA)

    6 × $0

    In-house · 3D Print

  • Focuser Board v2

    Carries the GSO focuser on the UTA ring

    110×96×8 board, Ø58 focuser bore (ASA)

    1 × $0

    In-house · 3D Print

  • Bearing Tower Plates

    Carry the altitude bearing hubs above the box top; slotted holes give ±10mm balance adjustment

    6mm 6061 plates, laser-cut (SendCutSend)

    2 × $0 (sponsor credit)

    Needed

  • Altitude Bearing Hubs

    EZ GOTO normally machines a GSO donor scope's bearing base — our scratch build fabricates its own; Romer offers free machining with the kit (confirm with them)

    2.75" OD × 2.375" 6061 round bar, faced + drilled

    2 × $25–40

    Needed

  • Heat-Set Insert Kit

    All printed-part threads use inserts — self-tapped plastic threads do not survive rooftop thermal cycling

    Brass M2–M5 assortment (ruthex, 270 pc)

    1 × $43

    Needed

  • UTA Hardware Set

    Fastens ring joints, vane feet, pole clamps; springs load the secondary collimation cell

    M4×50/M4×35 SS bolts, nuts, M3 collimation screws + compression springs, M5 threaded rod 1m

    1 × $18–25

    Needed

  • ASA Filament

    Final outdoor parts (PLA prototypes only — creeps above 55°C in rooftop sun)

    1kg spool, black, UV-stable

    1 × $18–24

    Needed

  • 1/4-20 pronged T-nuts

    16 × $8–10

    Needed

  • Dowel Pins

    2× POWERTEC 8-packs (16 pins)

    3/8" steel alignment pins

    16 × $36

    Needed

  • Assorted bolts, nuts, washers

    1 × $27

    Needed

  • Titebond III + polyurethane

    1 × $34–36

    Needed

  • Paint

    Exterior gets polyurethane (see Wood Glue + Finish)

    Flat black interior

    1 × $7

    Needed

Bearings · 4

  • PTFE Altitude Pads

    Kit includes both altitude + azimuth pads; ships on backorder

    1" × 1.5" virgin PTFE (medium kit)

    4 × $26

    Needed

  • PTFE Azimuth Pads

    Included in altitude pads bearing kit

    1.5" × 2" virgin PTFE

    3 × —

    Needed

  • Ebony Star Laminate

    Low-friction bearing surface — only a ~22" circle needed; a local laminate offcut beats the full-sheet price

    Wilsonart Ebony Star surface

    1 × $90

    Needed

  • 3/8"-16 × 3" stainless steel

    1 × $9

    Needed

Mirror Cell · 8

  • Mirror Cell v2

    Printed in-house; SCS flotation triangles sit on top for 9-point support

    Ø272 printed cell, 3-point pads + collimation nut pockets

    1 × $0

    In-house · 3D Print

  • 1" × 1" × 1/8" 6061 aluminum

    1 × $20–30

    Needed

  • Collimation Bolts

    POWERTEC 5-star thru-knobs + hardware-store 1/4-20 × 4" hex bolts

    1/4"-20 × 4" with knobs

    3 × $15–20

    Needed

  • Flotation Triangles

    Cut via SendCutSend $500 sponsor credit — see SCS Parts Plan doc

    6061 laser-cut 9-point triangles (SendCutSend)

    3 × $0 (sponsor credit)

    Needed

  • Mirror Clips

    Cut 3 clips from the 1×1×1/8 angle stock row

    Spring-loaded retaining clips

    3 × $0 (from angle stock)

    Needed

  • GE Silicone II clear

    1 × $9–12

    Needed

  • Rear Cooling Fan

    Accelerates mirror thermal equilibrium

    80mm 12V DC brushless

    1 × $8–12

    Needed

  • 60mm 12V DC brushless

    1 × $7–10

    Needed

Electronics · 24

  • Raspberry Pi 4

    Main computer — runs tracking, imaging, and web server

    Model B 4GB RAM

    1 × —

    Donated · Donated

  • MicroSD Card

    64GB Class 10 A2

    1 × —

    Donated · Donated

  • Ethernet Cable

    Network connection for Pi

    Cat5e/Cat6, 3–5m

    1 × —

    Donated · Donated

  • USB-C 5V 3A official PSU

    1 × $8–12

    Needed

  • NEMA 23 Stepper (Altitude)

    8 mm shaft matches the Romer ALT pinion 8 mm bore (previous pick was 6.35 mm — no fit)

    23HS30-2804S — 1.8° 1.9 N·m 2.8 A, 8 mm shaft

    1 × $28

    Needed

  • 1.8° bipolar NEMA 17 (EZ GOTO az axis, 10" Dob)

    1 × $15

    Needed

  • NEMA 17 Stepper (Focus)

    Superseded by ToupTek AAF electronic auto-focuser

    1.8° 0.4 N·m bipolar

    1 × —

    Donated · ToupTek Astro

  • ToupTek AAF Electronic Auto-focuser

    Replaces NEMA 17 + GT2 belt for focus drive

    Direct-drive focuser motor with USB control

    1 × —

    Donated · ToupTek Astro

  • DM542 Stepper Drivers

    Per EZ GOTO guide — TMC2209 (2A RMS) is marginal for 2.8A NEMA 23

    DM542 digital driver, 1/128 microstep

    2 × $66 ($33 each)

    Needed

  • GOTO main board + encoders + USB adapter

    1 × $165 ($150 kit + $15 accessories)

    Needed

  • AZ/ALT Gears Kit (Romer Optics)

    Bearing-base machining included when bought with the EZ GOTO kit

    12" stainless ALT sector gear + AZ gear & belt (L2.5m, W10mm) + motor slides/brackets

    1 × $113

    Needed

  • 12V 10A switching PSU

    1 × $14–20

    Needed

  • Buck Converter

    5V derivation handled by PPB Advance Gen 2 variable output

    12V → 5V 3A DC-DC

    1 × —

    Donated · Pegasus Astro

  • Pegasus Pocket Powerbox Advance Gen 2

    Integrated power management — replaces terminal block, MOSFETs, and buck converter

    12V power distribution + USB hub + dew control + env sensor

    1 × —

    Donated · Pegasus Astro

  • 15A blade fuse holder

    1 × $5

    Needed

  • Terminal Block

    Distribution handled by Pegasus PPB Advance Gen 2

    12-position barrier strip

    1 × —

    Donated · Pegasus Astro

  • 100µF 25V electrolytic

    3 × $5–7

    Needed

  • TVS Diodes

    SMD DO-214AA — use through-hole 1.5KE15CA if hand-wiring

    15V bidirectional TVS

    2 × $6

    Needed

  • 22AWG silicone wire assortment

    1 × $12–16

    Needed

  • Limit Switches

    BUYGOO V-156-1C25 6-pack

    Micro limit switch with lever

    4 × $7

    Needed

  • MOSFETs

    PWM control handled by PPB Advance Gen 2 dew heater outputs

    IRLZ44N logic-level N-channel

    2 × —

    Donated · Pegasus Astro

  • Pull-up Resistors

    25-pack — combine with ProtoSupplies diode order

    10kΩ 1/4W

    4 × $1

    Needed

  • Debounce Capacitors

    Only 4 needed — buy singles

    100nF ceramic

    4 × $1

    Needed

  • 1N4007 rectifier

    2 × $2

    Needed

Camera · 4

  • ToupTek ATR585C Cooled Camera

    Cooled deep-sky imaging camera with thermoelectric cooling

    8.3MP Sony IMX585 cooled CMOS, USB 3.0

    1 × —

    Donated · ToupTek Astro

  • ToupTek GPM462C Guide Camera

    Autoguider for closed-loop tracking correction

    2.1MP Sony IMX462 CMOS, USB 2.0, planetary/guiding

    1 × —

    Donated · ToupTek Astro

  • M42 to 1.25" nosepiece

    1 × $10–15

    Needed

  • USB 3.0 Cable

    Out of stock at Plugable — watch restock or sub Cable Matters active 5m (verify stock first)

    Active 5m USB 3.0 extension

    1 × $30

    Needed

Accessories · 6

  • Eyepiece

    Visual observing at star parties

    25mm Plössl 1.25"

    1 × $28–35

    Needed

  • Red-dot or 6×30 optical

    1 × $15–20

    Needed

  • Light Shroud

    Blocks stray light between UTA and mirror box. Fit-check: our UTA ring OD is 337mm — confirm against ES 10" truss shroud before ordering

    Stretch black nylon (ES 10" truss Dob)

    1 × $100

    Needed

  • Cheshire + sight tube combo

    1 × $25–37

    Needed

  • Dew Heater Strip

    Prevents dew on secondary; 12V — runs off Pegasus PPBA dew output

    480mm 12V strip (SVBONY SV192)

    1 × $25

    Needed

  • 5mm to 8mm flexible coupler

    1 × $8–12

    Needed